check password-less login
SSH allow password less login. If hacker set key, you will see it at
Here is on my local server
[[email protected] ~]# cat ~root/.ssh/authorized_keys ssh-rsa AAAAB3NzaC1yc2EGGGGBJQAAAIEAlFTVQcmbZJLf3vY629dMbAP4JO6fGVch9EDhcuNbGQEc1flU7Dcx6GBGuNzN3eyVbtTEL7jZ5VdAUS72ci5H3SY3z0Li5oMwOXd4M1Dnx5MknXFscwgNkjie1/WgKMGn0SchKiTjTj0GlMXnyPRhXBIuN+w0ukOo2CZ36vgL9G0= rsa-key-20041107 [[email protected] ~]#
This is my key, not by any key, if you see a key that is not set by you, you can delete the file.